Tech-kit Complete Handsfree Car Kit - Bluetooth 4.0 Controller, Dual USB Charger, Ground Loop Isolator and Vent Mount Driving is about freedom. Freedom from fear, to go where you want when you want to. To open the windows and feel the fresh air with a friend on an epic roadtrip or keep them tightly shut while you sing your heart out. You don't compromise and neither do we so buy with confidence. Listen to what you want, when you want - Make & receive calls so you are always in the action, even stream podcasts or GPS directions Premium Sound Quality (Echo Cancellation Technology Plus included Ground Loop Isolator) Compatible with any stereo Bluetooth enabled device (iPhone, Android, Blackberry etc.) Auto On/Off, Auto Switches between music and calls, Uses your cars Aux input and speakers